Pipe coupling ring



FIG. 1 is a front, top, right perspective view of a pipe coupling ring showing my new design;

FIG. 2 is a rear, top, left perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof; and

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines illustrating portions of the pipe coupling ring form no part of the claimed design. The dot-dash broken lines defining the boundaries of the claimed design form no part of the claimed design. 

CLAIM The ornamental design for a pipe coupling ring, as shown and described. 